CN212198853U - Desulfurization wastewater full electric drive processing system of coal-fired power plant - Google Patents
Desulfurization wastewater full electric drive processing system of coal-fired power plant Download PDFInfo
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- CN212198853U CN212198853U CN202020218396.8U CN202020218396U CN212198853U CN 212198853 U CN212198853 U CN 212198853U CN 202020218396 U CN202020218396 U CN 202020218396U CN 212198853 U CN212198853 U CN 212198853U
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Abstract
The utility model provides a desulfurization wastewater full electric drive treatment system of a coal-fired power plant, which comprises a plurality of reaction tanks, wherein the water outlets of the reaction tanks are communicated with the inlet of high-efficiency precipitation integrated equipment; water outlet and 1# electric driven membrane device of efficient precipitation integrated equipmentThe inlet of the No. 1 electrically driven membrane device is communicated with the inlet of the No. 2 electrically driven membrane device; a fresh chamber material liquid outlet of the No. 2 electrically driven membrane device is communicated with an inlet of the No. 3 electrically driven membrane device, and a concentrated chamber material liquid outlet of the No. 2 electrically driven membrane device is communicated with an inlet of the electrochemical device; the water outlet of the electrochemical device is communicated to the power plant seawater direct cooling circulation system. The utility model discloses a but the combined system retrieval and utilization desulfurization waste water 100% moisture of integrative equipment + multivalent separation electric drive membrane + concentrated electric drive membrane + electrochemical device is precipitated to chemical reaction + high efficiency, can utilize Na in the waste water again simultaneously2SO4And NaCl to produce gypsum and reduce the amount of bactericide needed in the circulating cooling water system.
Description
Technical Field
The utility model belongs to the technical field of coal fired thermal power factory desulfurization waste water treatment, especially, relate to a coal fired power plant desulfurization waste water full electric drive processing system.
Background
At present, in various desulfurization modes of a thermal power plant, boiler flue gas wet desulfurization occupies a larger and larger proportion due to high desulfurization efficiency, but the process has the defects that waste water is generated, the pH value of the waste water is 5-6, and simultaneously, a large amount of suspended matters (gypsum particles and SO) are contained2Hydroxides of Al and iron), fluorides and heavy metal elements such As As, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Sn, Zn and the like, and the wet limestone-gypsum method treatment process is mostly adopted for domestic power plant desulfurization. The flue gas contains a small amount of F brought from raw coal-And Cl-And various impurities, are washed after entering a desulfurization absorption tower and enter slurry, F-The combined action of the aluminum in the slurry and the aluminum in the slurry has shielding influence on the dissolution of limestone of the desulfurization absorbent, so that the solubility of the limestone is weakened, and the desulfurization efficiency is reduced; at the same time, Cl-Too high a concentration can corrode the system and structure of the absorption tower. Therefore, the limestone-gypsum wet flue gas desulfurization process usually requires discharging a part of filtrate water (generated by dehydrating slurry in an absorption tower) as desulfurization waste water to control Cl-、F-The ion concentration and the material balance of the absorption tower are maintained. Because the water quality is special and the pollution is strong, the desulfurization waste water must be treated separately for discharge, otherwise, the environment is polluted greatly. In addition, in order to improve the comprehensive utilization rate of water resources, various kinds of drainage such as reverse osmosis concentrated water, circulating system sewage and the like are generally used as water sources of the wet flue gas desulfurization system process in the power plant. The desulfurization wastewater becomes wastewater with the worst water quality at the tail end of the coal-fired power plant system. Therefore, the deep treatment of the desulfurization wastewater to realize the zero emission of the desulfurization wastewater becomes a new challenge for the planning design and the environment-friendly upgrading and reconstruction of the coal-fired power plant.
At present, the 'zero discharge' treatment technology for boiler flue gas desulfurization wastewater of a domestic thermal power plant mainly comprises a 'zero discharge' system for river-source power plant desulfurization wastewater, a three-water constant-benefit power plant desulfurization wastewater treatment system, a Huanengxing power plant desulfurization wastewater treatment system and a 'zero discharge' system for national electricity, Chinese and Hechuan power plant desulfurization wastewater. The river source power plant desulfurization wastewater zero-emission system adopts a four-effect evaporation crystallization system, is put into operation for up to 7 years at 12 months and 18 days in 2009, is the first creation in China, is mature and reliable, produces water to reach the reuse water quality standard, produces sludge as a brick making raw material, produces crystallized salt for a printing and dyeing mill, and has the steam consumption of 300 kg per ton of water treatment and the power consumption of 30 kWh according to calculation; the desulfurization wastewater treatment system of the three-water constant-benefit power plant is put into operation in 2012 till 4 years, the operation is stable, the quality of the effluent water meets the water quality requirement of circulating cooling water, the pretreatment is simplified, the produced crystal salt is miscellaneous salt and is treated as solid waste, and according to calculation, the steam consumption per ton of water treatment is 89.21 kg, and the power consumption is 26.63 kWh; the desulfurization wastewater treatment system of the Huanengxing power plant adopts a forward osmosis technology, and is debugged in 2015 at 4 months and 5 days, wherein the main components of the crystal salt are NaCl and Na2SO4The purity is higher than 95 percent, the system is researched and modified at present to improve the NaCl purity and provide conditions for comprehensive utilization, and according to calculation, the steam consumption per ton of water treatment is 90kg, and the power consumption is 8.3 kWh; the 'zero emission' system of the desulfurization wastewater of the national electric and Hanchuan power plant adopts a 'TMF softening + NF salt separation + SWRO + DTRO + MVR' process route, and is currently in a debugging stage. The 4 desulfurization wastewater treatment process routes have respective advantages and disadvantages, but have the following problems: 1) the softening and dosing cost of the pretreatment medicament is high, and the cost of the softening medicament per ton of water is calculated to be 20-30 yuan/m3Left and right; 2) the purity of the crystallized salt after evaporation is difficultThe method ensures that the water can only be treated as solid waste (hazardous waste) when the purity is low, and increases the cost for treating water per ton; 3) high cost of evaporation crystallization treatment, high steam consumption and power consumption, high treatment cost and the like. In order to overcome the defects of various industrial application process routes, the invention specially provides a desulfurization wastewater zero-emission process route which has the advantages of low cost of softening agent, no need of evaporation and crystallization and the like.
The electrochemical device is wastewater treatment equipment provided with an Fe-containing electrode, and mainly comprises a rectifier, an electrode, a pool body, a cable and the like. Through the direct current field of the rectifier, the electrode has oxidation-reduction reaction, and NaOH and H are continuously generated at the cathode2The anode continuously generates Cl2. By electrolysis of electrochemical devices capable of passing generated Cl2The content of organic matters in the wastewater is reduced, and the formed NaClO can be used as a bactericide component and added into a power plant seawater direct cooling circulation cooling system.
The electrically driven membrane technology is a membrane separation process in which ions pass through a selective ion exchange membrane under the action of an electric field force, and the core part of the electrically driven membrane technology is an anion-cation exchange membrane, namely the technology for selectively separating ions in a solution by utilizing the characteristic that the cation exchange membrane only allows cations to pass through and the anion exchange membrane only allows anions to pass through. Under the action of electric field force, the anions and cations in the solution are directionally transferred from one part of water body to another part of water body, so that the purposes of solution separation, purification and concentration are achieved. The bipolar membrane is provided, so that the application of electrodialysis is expanded. The bipolar membrane is formed by compounding an anion exchange membrane and a cation exchange membrane, and is generally called an intermediate catalytic layer between the two layers. The principle is as follows: when voltage is applied to two sides of the bipolar membrane, ions in the solution can be directionally transferred, meanwhile, water molecules can penetrate through the anion-cation exchange membrane and enter the middle catalyst layer, and are electrolyzed under the action of active groups on two sides to generate hydrogen ions and hydroxyl ions, so that the hydrogen ions and the hydroxyl ions serve as charge loads, and consumed water is replenished by permeating water in surrounding solution to the middle layer of the membrane. Compared with the conventional electrodialysis, the water dissociation rate under the action of the bipolar membrane is improved by more than 5 million times, so that the energy consumption is greatly reduced, and the application range of the electrodialysis is greatly extended. Bipolar membrane electrodialysis also belongs to the application range of electrodialysis, and different compartments (an acid compartment, an alkali compartment and a feed liquid compartment) are formed by combining a bipolar membrane with an ion exchange membrane, so that the bipolar membrane electrodialysis has unique advantages in the field of acid and alkali preparation. Under the action of a certain voltage, the anions and cations can respectively pass through the anion and cation exchange membranes and are combined with hydrogen ions and hydroxide ions generated by the bipolar membranes to generate corresponding acid and alkali.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coal fired power plant desulfurization waste water full electric drive processing system to the problem that mentions among the prior art.
For this reason, the above-mentioned purpose of the present invention is achieved by the following technical solutions:
the utility model provides a coal fired power plant desulfurization waste water full electric drive processing system which characterized in that: the coal-fired power plant desulfurization wastewater full-electric drive treatment system comprises a plurality of reaction tanks, wherein the reaction tanks are used for carrying out chemical reaction in the reaction tanks to remove fluorine ions, magnesium ions, calcium ions and the like contained in wastewater; the water outlet of the reaction tank is communicated with the inlet of the efficient precipitation integrated equipment; the water outlet of the high-efficiency precipitation integrated equipment is communicated with the inlet of the No. 1 electric driven membrane device, the No. 1 electric driven membrane device is used for separating chloride ions and sulfate ions in wastewater, so that the dilute chamber feed liquid of the No. 1 electric driven membrane device is rich in sulfate ions, and the concentrated chamber feed liquid is rich in chloride ions; a concentrated chamber material liquid outlet of the No. 1 electrically-driven membrane device is communicated with an inlet of the No. 2 electrically-driven membrane device, and a dilute chamber material liquid outlet of the No. 1 electrically-driven membrane device is communicated to the desulfurization island system; a dilute chamber feed liquid outlet of the No. 2 electrically-driven membrane device is communicated with an inlet of the No. 3 electrically-driven membrane device, and a concentrated chamber feed liquid outlet of the No. 2 electrically-driven membrane device is communicated with an inlet of the electrochemical device; chlorine and sodium hypochlorite are generated in the electrochemical device so as to reduce COD and bacteria in the wastewater at the feed liquid outlet of the 2# electrically driven membrane device; and a water outlet of the electrochemical device is communicated to the power plant seawater direct cooling circulation system. The power plant seawater direct cooling circulation system is directly cooled by seawater without indirect heat exchange through cooling water and plate exchange.
When adopting above-mentioned technical scheme, the utility model discloses can also adopt or make up and adopt following technical scheme:
as the utility model discloses a preferred technical scheme: the reaction tank comprises a 1# reaction tank and a 2# reaction tank, the 1# reaction tank and the 2# reaction tank are sequentially connected, sodium hydroxide is added into the 1# reaction tank, and sodium carbonate is added into the 2# reaction tank.
As the utility model discloses a preferred technical scheme: and a mechanical stirring device and a high-efficiency aeration device are arranged in the reaction tank to improve the reaction efficiency of the wastewater in the reaction tank.
As the utility model discloses a preferred technical scheme: the efficient precipitation integrated equipment is provided with a medicament adding area, a reaction area and a precipitation area; and a flocculating agent and coagulant aid adding inlet is arranged in the medicament adding area, and an HCl adding inlet is arranged on a water outlet pipeline of the high-efficiency precipitation integrated equipment.
As the utility model discloses a preferred technical scheme: the No. 1 electrically-driven membrane device is a multivalent ion separation electrically-driven membrane device, and the No. 2 electrically-driven membrane device is#Electrically driven membrane device and 3#The electric driving membrane devices are all concentrated electric driving membrane devices and are internally provided with homogeneous phase ion exchange membranes.
As the utility model discloses a preferred technical scheme: said 3#The material liquid outlet of the concentrated chamber of the electric driven membrane device is communicated to the liquid outlet 2#The water inlet end of the membrane device is electrically driven.
As the utility model discloses a preferred technical scheme: the electrochemical device comprises an electrode, a rectifier, cell body equipment and a cable, wherein the electrode is made of ruthenium dioxide or titanium.
The utility model provides a coal fired power plant desulfurization waste water full electric drive processing system has following technological effect:
1) through the combined system of the chemical reaction, the efficient precipitation integrated equipment, the multivalent separation electric driving membrane, the concentration electric driving membrane and the electrochemical device, 100 percent of water in the desulfurization wastewater can be recycled, and meanwhile, Na in the wastewater can be recycled2SO4And NaCl to produce gypsum and reduce the amount of bactericide needed in the circulating cooling water system.
2) Can improve the sedimentation rate of suspended matters through efficient sedimentation integrated equipment and can remove COD in partial wastewaterCrAnd the stability of system operation is improved.
3) The concentrated brine is treated by the electrochemical device, an evaporation crystallization treatment system with high energy consumption is not needed, and the resource utilization rate in wastewater can be improved.
4) The utility model can remove the solid waste disposal cost generated by the evaporative crystallization treatment method, and reduce the zero discharge treatment cost of the desulfurization waste water to a certain extent;
5) adopt the utility model provides a coal fired power plant's desulfurization waste water full electric drive processing system handles flue gas desulfurization waste water of thermal power plant and has economic benefits and social concurrently, has research and spreading value.
Drawings
FIG. 1 is a schematic representation of a desulfurization wastewater fully electric-driven treatment system of a coal-fired power plant provided by the present invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A desulfurization wastewater full electric drive treatment system of a coal-fired power plant comprises a plurality of reaction tanks, wherein the reaction tanks are used for carrying out chemical reaction in the reaction tanks to remove fluorine ions, magnesium ions, calcium ions and the like contained in the wastewater; the water outlet of the reaction tank is communicated with the inlet of the efficient precipitation integrated equipment; the water outlet of the high-efficiency precipitation integrated equipment is communicated with the inlet of the No. 1 electric driven membrane device to remove magnesium hydroxide and calcium carbonate generated in the reaction tank, so that the total hardness of the wastewater is lower than 20 mg/L; the 1# electrically driven membrane device is used for separating chloride ions and sulfate ions in wastewater, so that the dilute chamber feed liquid of the 1# electrically driven membrane device is rich in sulfate ions, and the concentrated chamber feed liquid is rich in chloride ions; a concentrated chamber material liquid outlet of the No. 1 electrically-driven membrane device is communicated with an inlet of the No. 2 electrically-driven membrane device, a dilute chamber material liquid outlet of the No. 1 electrically-driven membrane device is communicated to the desulfurization island system, and sulfate ions are removed by reacting with calcium ions in slurry of the desulfurization island system to form calcium sulfate; a dilute chamber feed liquid outlet of the No. 2 electrically-driven membrane device is communicated with an inlet of the No. 3 electrically-driven membrane device, and a concentrated chamber feed liquid outlet of the No. 2 electrically-driven membrane device is communicated with an inlet of the electrochemical device; chlorine and sodium hypochlorite are generated in the electrochemical device so as to reduce COD and bacteria in the wastewater at the feed liquid outlet of the 2# electrically driven membrane device; and a water outlet of the electrochemical device is communicated to the power plant seawater direct cooling circulation system.
In this embodiment: the reaction tank comprises a 1# reaction tank and a 2# reaction tank, the 1# reaction tank and the 2# reaction tank are sequentially connected, sodium hydroxide is added into the 1# reaction tank to remove fluorine, magnesium ions and the like contained in the wastewater, and sodium carbonate is added into the 2# reaction tank to remove calcium ions in the wastewater.
In this embodiment: and a mechanical stirring device and a high-efficiency aeration device are arranged in the reaction tank to improve the reaction efficiency of the wastewater in the reaction tank.
In this embodiment: the efficient precipitation integrated equipment is provided with a medicament adding area, a reaction area and a precipitation area; and a flocculating agent and coagulant aid adding inlet is arranged in the medicament adding area, and an HCl adding inlet is arranged on a water outlet pipeline of the high-efficiency precipitation integrated equipment so as to adjust the pH value of the outlet water to about 8.
In this embodiment: the No. 1 electrically-driven membrane device is a multivalent ion separation electrically-driven membrane device, and the No. 2 electrically-driven membrane device is#Electrically driven membrane device and 3#The electric driving membrane devices are all concentrated electric driving membrane devices and are internally provided with homogeneous phase ion exchange membranes.
In this embodiment: said 3#The material liquid outlet of the concentrated chamber of the electric driven membrane device is communicated to the liquid outlet 2#The water inlet end of the membrane device is electrically driven.
In this embodiment: the electrochemical device comprises an electrode, a rectifier, cell body equipment and a cable, wherein the electrode is made of ruthenium dioxide or titanium. Substances such as chlorine, sodium hypochlorite and the like are generated in the electrochemical device, COD in the wastewater can be removed and reduced to be below 5 mg/L, the substances can be used as sterilization components and added into a seawater direct cooling circulation system of a power plant to play a sterilization role, and the aim of recycling zero emission of the desulfurization wastewater is finally fulfilled
The above detailed description is provided for explaining the present invention, and is only a preferred embodiment of the present invention, but not for limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made by the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a coal fired power plant desulfurization waste water full electric drive processing system which characterized in that: the coal-fired power plant desulfurization wastewater full-electric drive treatment system comprises a plurality of reaction tanks, wherein the reaction tanks are used for carrying out chemical reaction in the reaction tanks to remove fluorine ions, magnesium ions and calcium ions contained in wastewater; the water outlet of the reaction tank is communicated with the inlet of the efficient precipitation integrated equipment; the water outlet of the high-efficiency precipitation integrated equipment is communicated with the inlet of the No. 1 electric driven membrane device, the No. 1 electric driven membrane device is used for separating chloride ions and sulfate ions in wastewater, so that the dilute chamber feed liquid of the No. 1 electric driven membrane device is rich in sulfate ions, and the concentrated chamber feed liquid is rich in chloride ions; a concentrated chamber material liquid outlet of the No. 1 electrically-driven membrane device is communicated with an inlet of the No. 2 electrically-driven membrane device, and a dilute chamber material liquid outlet of the No. 1 electrically-driven membrane device is communicated to the desulfurization island system; a dilute chamber feed liquid outlet of the No. 2 electrically-driven membrane device is communicated with an inlet of the No. 3 electrically-driven membrane device, and a concentrated chamber feed liquid outlet of the No. 2 electrically-driven membrane device is communicated with an inlet of the electrochemical device; chlorine and sodium hypochlorite are generated in the electrochemical device so as to reduce COD and bacteria in the wastewater at the feed liquid outlet of the 2# electrically driven membrane device; and a water outlet of the electrochemical device is communicated to the power plant seawater direct cooling circulation system.
2. The all-electric drive treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized in that: the reaction tank comprises a 1# reaction tank and a 2# reaction tank, the 1# reaction tank and the 2# reaction tank are sequentially connected, sodium hydroxide is added into the 1# reaction tank, and sodium carbonate is added into the 2# reaction tank.
3. The all-electric drive treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized in that: and a mechanical stirring device and a high-efficiency aeration device are arranged in the reaction tank to improve the reaction efficiency of the wastewater in the reaction tank.
4. The all-electric drive treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized in that: the efficient precipitation integrated equipment is provided with a medicament adding area, a reaction area and a precipitation area; and a flocculating agent and coagulant aid adding inlet is arranged in the medicament adding area, and an HCl adding inlet is arranged on a water outlet pipeline of the high-efficiency precipitation integrated equipment.
5. The all-electric drive treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized in that: the No. 1 electrically-driven membrane device is a multivalent ion separation electrically-driven membrane device, and the No. 2 electrically-driven membrane device is#Electrically driven membrane device and 3#The electric driving membrane devices are all concentrated electric driving membrane devices and are internally provided with homogeneous phase ion exchange membranes.
6. The all-electric drive treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized in that: said 3#The material liquid outlet of the concentrated chamber of the electric driven membrane device is communicated to the liquid outlet 2#The water inlet end of the membrane device is electrically driven.
7. The all-electric drive treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized in that: the electrochemical device comprises an electrode, a rectifier, cell body equipment and a cable, wherein the electrode is made of ruthenium dioxide or titanium.
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| CN202020218396.8U CN212198853U (en) | 2020-02-27 | 2020-02-27 | Desulfurization wastewater full electric drive processing system of coal-fired power plant |
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| CN202020218396.8U CN212198853U (en) | 2020-02-27 | 2020-02-27 | Desulfurization wastewater full electric drive processing system of coal-fired power plant |
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Address after: 313102 Zhejiang Huzhou Changxing County lijiaxiang town industrial concentration area Patentee after: Shangtuo Environmental Technology (Changxing) Co.,Ltd. Address before: 313102 Zhejiang Huzhou Changxing County lijiaxiang town industrial concentration area Patentee before: CHANGXING SHANGTUO ENVIRONMENTAL TECHNOLOGY Co.,Ltd. |
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